mirror of https://github.com/hashicorp/consul
138 lines
3.2 KiB
Go
138 lines
3.2 KiB
Go
// Copyright (c) HashiCorp, Inc.
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// SPDX-License-Identifier: BUSL-1.1
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package protohcl
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import (
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"github.com/hashicorp/hcl/v2"
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"github.com/hashicorp/hcl/v2/hclparse"
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"github.com/zclconf/go-cty/cty/function"
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"google.golang.org/protobuf/reflect/protoreflect"
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)
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// UnmarshalContext provides information about the context in which we are
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// unmarshalling HCL. It is primarily used for decoding Any fields based on
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// surrounding information (e.g. the resource Type block).
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type UnmarshalContext struct {
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// Parent context.
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Parent *UnmarshalContext
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// Name of the field that we are unmarshalling.
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Name string
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// Message is the protobuf message that we are unmarshalling into (may be nil).
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Message protoreflect.Message
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// Range of where this field was in the HCL source.
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Range hcl.Range
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}
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// ErrorRange returns a range that can be used in error messages.
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func (ctx *UnmarshalContext) ErrorRange() hcl.Range {
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for {
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if !ctx.Range.Empty() || ctx.Parent == nil {
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return ctx.Range
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}
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ctx = ctx.Parent
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}
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}
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func Unmarshal(src []byte, dest protoreflect.ProtoMessage) error {
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return UnmarshalOptions{}.Unmarshal(src, dest)
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}
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type UnmarshalOptions struct {
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AnyTypeProvider AnyTypeProvider
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SourceFileName string
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FieldNamer FieldNamer
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Functions map[string]function.Function
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}
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func (u UnmarshalOptions) Unmarshal(src []byte, dest protoreflect.ProtoMessage) error {
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rmsg := dest.ProtoReflect()
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file, diags := hclparse.NewParser().ParseHCL(src, u.SourceFileName)
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// error performing basic HCL parsing
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if diags.HasErrors() {
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return diags
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}
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u.clearAll(rmsg)
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if u.FieldNamer == nil {
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u.FieldNamer = textFieldNamer{}
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}
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return u.decodeMessage(
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&UnmarshalContext{Message: rmsg},
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u.bodyDecoder(file.Body),
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rmsg,
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)
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}
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func (u UnmarshalOptions) bodyDecoder(body hcl.Body) MessageDecoder {
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return newBodyDecoder(body, u.FieldNamer, u.Functions)
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}
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func (u UnmarshalOptions) decodeMessage(ctx *UnmarshalContext, decoder MessageDecoder, msg protoreflect.Message) error {
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desc := msg.Descriptor()
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if desc.FullName() == wellKnownTypeAny {
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return u.decodeAny(ctx, decoder, msg)
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}
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tracker := newOneOfTracker(u.FieldNamer)
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return decoder.EachField(FieldIterator{
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Desc: desc,
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Func: func(field *IterField) error {
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if err := tracker.markFieldAsSet(field.Desc); err != nil {
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return err
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}
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var (
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protoVal protoreflect.Value
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err error
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)
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switch {
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case field.Val != nil:
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protoVal, err = u.decodeAttribute(
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&UnmarshalContext{
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Parent: ctx,
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Name: field.Name,
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Range: field.Range,
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},
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func() protoreflect.Value { return msg.NewField(field.Desc) },
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field.Desc,
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*field.Val,
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true,
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)
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case len(field.Blocks) != 0:
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protoVal, err = u.decodeBlocks(ctx, field.Blocks, msg, field.Desc)
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default:
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panic("decoder yielded no blocks or attributes")
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}
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if err != nil {
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return err
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}
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if protoVal.IsValid() {
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msg.Set(field.Desc, protoVal)
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}
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return nil
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},
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})
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}
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type newMessageFn func() protoreflect.Value
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func (u UnmarshalOptions) clearAll(msg protoreflect.Message) {
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fields := msg.Descriptor().Fields()
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for i := 0; i < fields.Len(); i++ {
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msg.Clear(fields.Get(i))
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}
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}
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